= num messages
  3.03k	89.73%	weather/experimental
347.000	10.27%	weather/surface-based-observations
		347.000	10.27%	/synop
  3.38k	100.0%	(total)
= size
274.15M	99.89%	weather/experimental
308.39k	 0.11%	weather/surface-based-observations
		308.39k	 0.11%	/synop
274.45M	100.0%	(total)
= n topics for centreid
ca-eccc-msc-global-discovery-catalogue	1
io-wis2dev-11-test	1
io-wis2dev-12-test	1
io-wis2dev-13-test	1
io-wis2dev-14-test	1
io-wis2dev-15-test	1
my-metmalaysia	2
mz-inam	1
= n topics for category
weather/experimental	5
weather/surface-based-observations/synop	2